Private Server Emails configuring and troubleshooting - - - Redsocks setup/configuration.

3rd-party smtp servers are uploaded in our ecommerce shop. They are going into spam folder. We need them to send email and pass spf,dkim,dmarc exactly as they would . We have the correct settings/records, need someone to view and fix any issues to ensure our emails are going to inbox from may be exim/postfix/WHM/cPanel. After that, install and configure redsocks-firewall rules to redirect traffic via a set of socks5's.